In http://members.xoom.com/dmilos/prg/pov/maypovpage.htm
you can find:
 - patch for povray which will add new height_field types.
 - examples of above.

And, also visit my tracer at:
 http://members.xoom.com/dmilos/prg/rt/rt.htm
                dmi### [at] pttyu

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